package com.changgou.filter;

import com.changgou.util.JwtUtil;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;


@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {

    private static final String AUTHORIZE_TOKEN= "token";

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //登录请求直接放行
        if (request.getURI().getPath().contains("/admin/login")) {
            return chain.filter(exchange);
        }
        HttpHeaders headers = request.getHeaders();
        String token = headers.getFirst(AUTHORIZE_TOKEN);
        //令牌为空直接返回
        if (StringUtils.isEmpty(token)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //不为空解析令牌
        try {
            JwtUtil.parseJWT(token);
        } catch (Exception e) {
            //解析出错直接返回
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //令牌正确放行
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
